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Tool life control method based on disturbance load torque of motor

  • US 5,602,347 A
  • Filed: 11/15/1994
  • Issued: 02/11/1997
  • Est. Priority Date: 03/17/1993
  • Status: Expired due to Term
First Claim
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1. A method of controlling a tool life of a machine tool having a spindle and a feed shaft, comprising the steps of:

  • (a) executing a predetermined machining operation on a predetermined workpiece using said machine tool;

    (b) estimating, using a disturbance estimating observer, a disturbance load torque acting on a motor for driving said spindle or a motor for driving said feed shaft during the execution of said machining operation;

    (c) comparing said estimated disturbance load torque with a set reference value and outputting a tool life termination signal when said estimated disturbance load torque reaches the set reference value; and

    controlling said tool life of said machine tool based on said tool life termination signal.

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